Pest and Disease Directory

Cabbage looperCabbage looper. Photo: Whitney Cranshaw, Colorado State University,, author of Garden Insects of North America

Identifying the problem is the first step in finding an earth-friendly way to reduce — or even eliminate — the damage caused by garden pests. Check the list below for the most common causes of garden problems.

Keep in mind that the 95 percent of garden visitors are either helpful or harmless. Beneficial insects include ladybugs, lacewings and many others. Learn more in the article Most Bugs are Good Bugs.

What's more, don't forget the pollinators. Bees, moths, butterflies, wasps and beetles all play a role in pollination. Learn more in the article All About Pollinators.




Caterpillars Leaf Symptoms Small Mammals
Armyworm Angular Leaf Spot Chipmunks
Cabbage Looper Bacterial Blight Gophers
Cabbageworm Bacterial Spot Mice
Codling Moth Bacterial Wilt Moles
Corn Earworm Corn Leaf Blights Opossums
Grasshoppers Downy Mildew Rabbits
Pickleworm Early Blight Raccoons
Tomato Hornworm Late Blight Rats
  Powdery Mildew Skunks
  Septoria Leaf Spot Squirrels
  White Mold Voles
Small Insect Pests Root Symptoms Large Mammals
Aphids Clubroot Bear
Fruit Fly   Coyote
Fungus Gnat   Deer
Pea Weevil    
Pepper Maggot    
Spider Mites    
Beneficial Insects Fruit Symptoms Other
Ladybugs Blossom-End Rot Dogs & Cats
Parasitic Wasp Catfacing Birds
Green Lacewing Corn Smut Snakes
  Phytophthora Fruit Rot  
  Potato Scab  
Beetles Multiple Plant Parts Control Measures
Asian Lady Beetle Anthracnose Fencing Techniques
Asparagus Beetle Black Rot Trapping Techniques
Bean Leaf Beetle    
Blister Beetle    
Colorado Potato Beetle    
Corn Rootworm    
Cucumber Beetle    
Flea Beetle    
Japanese Beetle    
Lily Leaf Beetle    
Mexican Bean Beetle    
Sweet Potato Weevil    
European Corn Borer    
Peach Tree Borer    
Squash Vine Borer    
At or Below Ground    
Carrot Rust Fly    
Celery Leaftier    
Fire Ant    
Root Maggot    
Root Weevil    
Wire Worm    
True Bugs    
Four-Lined Plant Bug    
Harlequin Bug    
Tarnished Plant Bug    
Squash Bug    
Stink Bug    

Below: Colorado potato beetle eggs, larvae, and adult beetle.

Potato Beetle Eggs
Potato Beetle Larvae
Potato Beetle Adult
Questions and answers

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Last updated: 07/08/2023